*{
    margin: 0;
    padding: 0;
}
body{
    display: flex;
    height: 100vh;
    overflow: hidden;
    background: url('../img/规则壁纸.png');
    background-size: cover;
}
#header{
width: 600px;
}
img{
width: 70%;
}  
.ks{
margin: 45% 25%;
}
  